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-Aviation
Material & Process
| Question | Answer |
|---|---|
| Dimpling | bents the sheet mechanicly being joint to accomodate the river head |
| AN470 | replaces almost all other head designs |
| AN430 | use on aircrafts build before 1955 |
| AN455 | use on internal structures and applications requiring high head strengh |
| 1100 aluminum (A) | this rivet lacks suficient strengh for structural applications |
| 2117 aluminum (AD) | most used for manufacturing and maintenance modern aircrafts, don't requiere heat treatment also known as field rivets |
| 5056 aluminum (B) | for magnesium structures |
| 2017 aluminum (D) | modified to 2017 alloy call crack free rivet |
| AN | airforce Navy |
| MS | military standard |
| NAS | national aerospace standard |
| SAE | society american engeniers |
| SOLID CRACK RIVETS | unlike other type fasteners rivets change in dimention to fit the size of the hole |
| RIVET CODES | rivets are given codes for their size, head, and alloy material. Two system AN and MS20 |
| AN 470 AD 4 5 | airforce navy, universal head, 2117T4 alloy, diameter 1/32, lenght 1/16 |
| how do i measure AN470 rivet | from the bottom of the head to the end of the shank |
| how do i measure AN426 rivet | from the top of the head to the end of the shank |
| COUNTERSINK | a process in wich metal in the top sheet is cut away in the shape of the rivet head |
| CRACK FREE RIVET | a new version of 2017 (D) rivet for jet engines with a minumun shear stregh of 34ksi |
| AMERICAN NACIONAL SERIES | have more threads per inche |
| AMERICAN STANDARD UNIFIED SERIES | have less threads per inche |
| COARSE OR FINE THREADS | assigned by class to fit from 1 to 5 |
| CLASS 1 | (loose) you can turn a nut all the way down with fingers like wing nuts |
| CLASS 2 | (free) need a wrench all the way down |
| CLASS 3 | (medium)need a wrench all the way down |
| CLASS 4 | (close) need a wrench all the way down |
| CLASS 5 | (tight)need a wrench all the way down |
| AIRCRAFT NUTS | are fine thread w/ class 3 whereas screws are tipically a class 2 or 3 fit |
| STANDARD AIRCRAFT NUTS | this are identified by diameter and lenght |
| AIRCRAFT BOLT MATERIALS | cadmiun plated-nickel steel-corrosion resistan steel-2024 alluminun alloy |
| AIRCRAFT BOLTS | unless specify this are made of cadium plated nicke steel, corrosion resistan is identify by the letter c between the diameter and the lenght and 2024 alluminum alloy a DD between the diameter and the lenght |
| ALLUMINUM ALLOY AND STEEL BOLTS SMALLER THAN AN3 | FAA forbids the use of this in structural components |
| A LETTER A AT THE END OF THE LENGHT OF A BOLT | this means there is no hole in the shank |
| AN73 - AN81 | (DRILL HEAD ENGINE BOLTS) BOLTS HEX-HEADED STEEL BOLTS SIMILAR TO AN3 TO AND 20 |
| CLOSE TOLERANCE BOLTS | designated as an173 to an186 ground tolerance of +0.000 - 0.0005 inch |
| CLEVIS BOLT | an21 to an36 a domed head that is tipically slotted to accept a screwdriver the nut on most clevis bolts are safetied with a cotter pin. |
| IF NOTHING IS SPECIFY | it is a good practice to use awasher between the head of the nut and the nut to protect the material. |
| AN310 AIRCRAFT CASTLE NUT | identify by the letter D example an310d-6 2017 alluminum alloy |
| AN320 SHEAR CASTLE NUT | use only for shear loads on clevis bolts |
| AN315 PLAIN NUT | plain nut has no castallations a lock washer must be used, used for either tensil or shear loads. |
| AN350 WING NUT | it is use for frequenly removed parts with out tools example an350-616 where 6 is for 3/8 nut and 6/16 inch bolt class 2 (free) |
| SELF LOCKING NUTS | two types fiber or nylon and metal |
| LOW TEMPERATURE SELFT LOCKING NUT | AN365 class 3 (medium) nylon locknut never to be use in temperatures more than 250f if more than 3 threads expose (FAIL) |
| METAL SELF LOCKING NUT | for applications where the temp is more than 250f AN363 |
| MACHINE SCREWS | widely use structural same strengh as bolts self-taping to join light materials |
| PLAIN WASHERS | AN960 provide smooth surface between the nut and the material |
| LOCK WASHERS | when no convinient to use self locking nuts |
| SPECIAL WASHER | keyed washer use as a sefety device, small keys to engage slots cut in to bolts |
Created by:
cvega_00
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